I believe that VisiCalc was the first to ship a functional spreadsheet. I remember watching RichHarris’s “Rich Harris - Rethinking reactivity” video introducing Svelte 3, and he discussed an earlier academic spreadsheet concept.

https://m.youtube.com/watch?v=AdNJ3fydeao

I used the following “terminal” spreadsheets

VisiCalc on a Radio Shack Model III

Microsoft MultiPlan on MS-DOS

Lotus 1-2-3 on MS-DOS